Specifications include, but are not limited to: PACKAGED ROOFTOP UNITS a. ACCEPTABLE MANUFACTURERS: Daikin, Johnson Controls, Trane. Provide with 5-year warranty. b. GENERAL i. Configuration: 1. Return plenum I economizer section 2. Filter section 3. Cooling coil section 4. Supply fan section 5. Gas heating section 6. Condensing unit section ii. The complete unit shall be UL listed. Gas furnace shall be UL/ETL listed and classified in accordance with ANSI-Z 21.47. iii. Each unit shall be specifically designed for outdoor rooftop application and include a weatherproof cabinet. Each unit shall be completely factory assembled and shipped in one piece. Units shall be shipped fully charged with Refrigerant 410A and oil. CASING i. Panel construction shall be 18 GA single wall construction with a baked powder coat finish. Insulation shall be a minimum of 3/4" thick fiberglass with a foil face surface. Insulation shall be glued to the panel as well as mechanically fastened. Panel design shall not have any exposed insulation edges. ii. Exterior surfaces shall be constructed of 18 GA, G90 galvanized, with a baked powder coat finish of a neutral color. Finished panel surfaces to withstand a minimum 1000-hour salt spray test in accordance with ASTM Bl17 standard for salt spray resistance. SUPPLY FAN i. Supply fan shall be a double width double inlet (DWDI) forward curved centrifugal fan. The supply fan shall be mounted using solid-steel shafts and wheel hubs with mating keyways. ii. The fan assembly shall have adjustable pitched sheaves on the motor. Bushings shall be used on all sheaves to allow for easy removal of the pulleys from the fan and motor shaft. Fixed- bore pulleys fastened to the shaft by setscrews will not be allowed. The drives shall be selected with a 1.2 service factor